How to use printStackTrace method of org.junit.runners.model.MultipleFailureException class

1/**
2 * Copyright (c) Facebook, Inc. and its affiliates.
3 *
4 * <p>This source code is licensed under the MIT license found in the LICENSE file in the root
5 * directory of this source tree.
6 */
7package com.facebook.react.testing;
8
9import java.io.PrintWriter;
10import java.io.StringWriter;
11import java.util.List;
12
13/**
14 * Custom implementation of {@link org.junit.runners.model.MultipleFailureException} that includes
15 * stack information of collected exception as a part of the message.
16 */
17public class MultipleFailureException extends org.junit.runners.model.MultipleFailureException {
18
19  public MultipleFailureException(List<Throwable> errors) {
20    super(errors);
21  }
22
23  @Override
24  public String getMessage() {
25    StringBuilder sb = new StringBuilder();
26    List<Throwable> errors = getFailures();
27
28    sb.append(String.format("There were %d errors:", errors.size()));
29
30    int i = 0;
31    for (Throwable e : errors) {
32      sb.append(String.format("%n---- Error #%d", i));
33      sb.append("\n" + getStackTraceAsString(e));
34      i++;
35    }
36    sb.append("\n");
37    return sb.toString();
38  }
39
40  private static String getStackTraceAsString(Throwable throwable) {
41    StringWriter stringWriter = new StringWriter();
42    throwable.printStackTrace(new PrintWriter(stringWriter));
43    return stringWriter.toString();
44  }
45}
46

Source: MultipleFailureException.java

/**
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * <p>This source code is licensed under the MIT license found in the LICENSE file in the root
 * directory of this source tree.
 */
package com.facebook.react.testing;

import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.List;

/**
 * Custom implementation of {@link org.junit.runners.model.MultipleFailureException} that includes
 * stack information of collected exception as a part of the message.
 */
public class MultipleFailureException extends org.junit.runners.model.MultipleFailureException {

  public MultipleFailureException(List<Throwable> errors) {
    super(errors);
  }

  @Override
  public String getMessage() {
    StringBuilder sb = new StringBuilder();
    List<Throwable> errors = getFailures();

    sb.append(String.format("There were %d errors:", errors.size()));

    int i = 0;
    for (Throwable e : errors) {
      sb.append(String.format("%n---- Error #%d", i));
      sb.append("\n" + getStackTraceAsString(e));
      i++;
    }
    sb.append("\n");
    return sb.toString();
  }

  private static String getStackTraceAsString(Throwable throwable) {
    StringWriter stringWriter = new StringWriter();
    throwable.printStackTrace(new PrintWriter(stringWriter));
    return stringWriter.toString();
  }
}